If it is cold light whitening, it is easy to damage the tooth glaze. It uses blue light transmission technology to make whitening agent (mainly hydrogen peroxide) pass through the tooth tubule and undergo redox reaction on the surface and deep layer of teeth, thus achieving the effect of spot removal and whitening. Cold light bleaching is a kind of chemical bleaching. Bleach is very harmful to enamel, which can easily make dentin lose the necessary protection and cause the pain of cold and heat allergy. If dentine hypersensitivity, it will aggravate the condition, so we should cure the dental disease first, and then carry out cold light whitening.
In fact, tooth cleaning powder is the same as daily brushing and tooth washing. It only cleans the dirt and stains on the surface of teeth, and can't change the color of teeth. At most, it is only to restore the original color of teeth, not to whiten teeth.
Many people use it for a long time because they expect to whiten their teeth. In fact, it will wash away your enamel, which is very harmful to your teeth.